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Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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1answer
23 views

Can I merge blockchain downloads?

I downloaded the most recent 15GB of the Bitcoin blockchain. But I also have a back up from a year ago when I downloaded some more. Can I merely copy the old blockchain files into ~/.bitcoin and have ...
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0answers
17 views

Number of nodes in PBFT protocol [closed]

If there are atmost 10 malicious nodes in blockchain can exist at any time. The PBFT protocol requires 3f + 1 nodes to tolerate up to f malicious nodes, the admin A wants to have exactly 31 nodes in ...
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2answers
35 views

Delay of a revocable transaction in the Lightning Network

The Lightning Network Whitepaper describes the concept of Revocable Sequence Maturity Contracts (RSMC), which allows a commitment transaction to be revoked during a predefined delay after the channel ...
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2answers
49 views

Isn't burning bitcoins a kind of fraud?

BitCoin burning is the process by which digital currency miners and developers can remove bitcoins from circulation, thereby slowing down inflation rates or reducing the total circulating supply of ...
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0answers
31 views

I was stolen my ETH [closed]

hello I was recently the victim of a hack consisting in withdrawing me all my wallet without being able to do anything. Basically some paid me in ETH with my public key and then a few minutes later I ...
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0answers
26 views

Understanding paper bitcoin wallets [duplicate]

I'm doing a project on bitcoin and have no idea what is expected of me. The question asks to create a public address and private key to unlock, and then to move on to the private wallet (this is using ...
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1answer
25 views

Tracing Blockchain.com Wallet-ID from Receiver Address. Address Re-use

I am wanted to question related to blockchain.com ? If i have some one BTC to BTC receiver address can i trace name or wallet id or something? For example if i generate multiple btc to btc receiver ...
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0answers
31 views

Is Bitcoin a scam or safe to invest in [duplicate]

Is bitcoin a fraud/scam? If not, why are there people constantly calling it a Ponzi scheme, a pyramid scheme or other things similar? Does this indicate that these things have something in common in ...
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0answers
10 views

Bitcoinj Doesn't increase wallet value

this is the initialization of wallet and block and PeerGroup : Wallet wallet = new Wallet(params, KeyChainGroup.createBasic(params)); BlockChain chain = new BlockChain(params, wallet, new ...
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0answers
48 views

How do I find out where my bitcoins got sent to?

I withdrew bitcoin from my account in Binance in 2018 and still have the email they sent with address it said it sent to,18bVuA2FxDdz5gE4qf9MgbsNxp2F46PaLD The time and amount looked correct. Now I ...
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2answers
785 views

Where and how are raw transactions stored on the blockchain?

My understanding is that transactions are stored on the blockchain in double hashed format: ie SHA256(SHA256(rawtransaction)). But it is also possible to get access to the raw transaction. This means ...
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1answer
32 views

Developing a Bitcoin POS (Payment Page) - How do I identify the transaction

This is probably a basic question but I can not find an answer. We are developing a BTC payment process for a Point-of-Sale. We have managed to build this fine and can make requests (QR code) for a ...
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3answers
39 views

Bitcoin in wallet transactions but not on the blockchain (old wallet)

I've been checking old wallets and found an unconfirmed transaction that's on the wallet but not on the blockchain transaction id (missing from blockchain) ...
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0answers
35 views

I have 12 phrase recovery code for bitcoin wallet [closed]

I have 12 phrase recovery code for bitcoin wallet and I use it for purchased shop and for every deposit generate a new wallet now I restore my 12 word to blockchain and electrum and exodus and … but ...
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1answer
29 views

what happens to low-fee or forgotten transactions

If a transaction has a fee that is too low then it is possible for the transaction to either age out of the mempool (14 days) or get removed because the mempool reaches its max size. So what happens ...
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2answers
99 views

What can I do if someone obtained control of my blockchain wallet?

I fell for a bitcoin scam and I would like to undestand what are the risk associated to it. i established contact with scammer on instgram he convinced me to join the mining pool i had to create a new ...
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1answer
51 views

Why do transactions have to be bundled in a block? Why not mine single transactions separately?

Why do transactions have to be bundled in a block? Why not mine single transactions separately? What is the advantage of bundling transactions in a block? Also are there any blockchains/decentralized ...
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1answer
52 views

How does Bitcoin verify that a user owns the bitcoins he/she spent?

I'm making my own blockchain based currency for a school project and kind of hit a roadblock. I have a wallet class which initializes with zero coins. What prevents the user from just sending a ...
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1answer
60 views

Money sent to wallet was removed in unexpected second transaction 30 minutes later

I got sent bitcoins to my cake address then the coins went into the account as unconfirmed for about half an hour then they were sent to another address, and the confirmations have finished and i dont ...
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3answers
104 views

Why must the entire chain be included in calculations if it's already been validated. Why can't the validated portions be archived to save energy? [duplicate]

I'm new to this so don't laugh. If all of the previous transactions in a blockchain have been validated as authentic, why does the entire chain have to be carried forward in the calculations? Why ...
0
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1answer
38 views

How can one join and leave Blockchain network? [duplicate]

As a newbie, it seems a bit abstract for me to imagine how Blockchain works! I'm curious that how my friends and I can join a Blockchain network? When we don't want to stay, can we silently leave and ...
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1answer
46 views

What is the Optimal block size based on 90 percentile block propogation delay?

We can have pruned nodes that can verify blocks and transactions so the block size can be increased without leading to the centralization of block verification. But if we increase block size then ...
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4answers
84 views

What is the meaning of difficulty in Bitcoin mining?

I'm a beginner in Bitcoin and Blockchain technology, so I have a question after reading about the difficulty in Bitcoin mining: What the difficulty actually means? I read that A high difficulty means ...
2
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1answer
229 views

Some technical questions about Bitcoin [closed]

I'm a developer. I've read a lot about Bitcoin structure and how it works. But yet something confuse me. I would like to share them with you and read your answers: When a miner solves a block, how ...
2
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1answer
48 views

Forced fork of older, low difficulty blocks

Let’s assume main chain (A) height is 1000 and the difficulty adjustment is 50 blocks. At height 450, the difficulty is very small. By modifying timestamp of blocks 450-500, I mine a fork (B) such ...
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1answer
36 views

If nonce can change the hash then it should be changing the next block's previous hash?

I am studing blockhain and i know that a block hash is linked to the next block in previous hash and it cant be changed for valid reason. Reason is : because if someone have changed hash then then he/...
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0answers
27 views

Submitting new block to blockchain

Supposed that I have managed to mine a new block that meets all requirements successfully by building my own script that can collect transactions and add them to new block and hashing the new block ...
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2answers
157 views

Is there a way to change Bitcoin Open Source code to be more Environmentally friendly?

If Bitcoin is open source as proponents mention, why can't make Bitcoin as environmentally friendly as Ripple, Dogecoin, Cardono etc? Elon Musk tanked the market by mentioning Dogecoin is More ...
4
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1answer
116 views

What exactly is a “blockchain developer”?

Hello everyone. This isn't specifically a bitcoin thread but due to recent events I think it is important that people get an understanding of the real Elon Musk as I have no doubt he will try and ...
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0answers
27 views

Get/Calculate Address

I'm currently using a program that analyses the block files. It splits all the stuff into multiple .csv files. Is there any method I can do to get the addresses & amount sent/received from tx_in ...
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1answer
73 views

If there are a significant number of pruned nodes on the network will it impact network security?

The size of the Bitcoin blockchain is reaching 350 MB and adding more than 60GB per year. I feel verification node centralization a risk if the cost of storage does not drop. My question 1: Is using ...
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2answers
80 views

Where can I turn the unique hash result of SHA256 to bitcoin?

i watched on youtube from 3Brown1Blue channel about "how bitcoin works", it said what makes bitcoin valued is come from the unique hash result of SHA256. for example if someone put string to ...
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0answers
27 views

why do i lost my bitcoin on blockchain wallet without forgetting private key?

This is the first time to use Blockchain and send my bitcoin into it. But i was sent into private key wallet address and store it. Next day, when i was login my wallet and say wrong password . So i ...
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2answers
41 views

During a IBD : Initial Block Download by a full node, from where is the blockchain downloaded?

I understand that a full node requires to do an IBD before being able to verify transactions. So, it downloads the ledger upto now, which is known as Initial Block Download. But what I don't ...
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1answer
41 views

How transaction happen in blockchain?

Suppose there is a cryptocurrency with a chain of 5 blocks. When users trading with this cryptocurrency, then:- how the buy and sell will be going to happen i.e. Which block will make the transaction ...
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1answer
25 views

Are trades done on exchanges added to blocks?

I found a few answers to this question here, here, and here, but my doubts weren't cleared. Are trades done on exchanges added to blocks? Or are they only added once you withdraw the funds to your own ...
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3answers
131 views

Bitcoin Fraud/Recovery Protocol Proposals

Does Bitcoin plan to implement any Fraud/Loss Prevention in their protocol? I just read a story of how Brokerage Exchange Shapeshift, and Internal Employee stealing private keys from their customers. ...
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2answers
585 views

Why is the full blockchain required, effectively forever?

I do understand that every block is validated in terms of the blocks before it by way of the previous block's hash, all the way back to the genesis block. However, could the protocol be modified such ...
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0answers
32 views

Transaction blocked by Blockchain [duplicate]

Payment was processed to me. Fees were requested to pay to sender. Transaction was unconfirmed and due to delay I was requested to pay the following fees to unblock transaction. Is this correct?
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2answers
101 views

Did Bitcoin founders know Bitcoin is not scalable at Base Layer?

Given Bitcoin takes 45 min per Transaction, and consumes lot of energy (around 1 million Visa transactions), https://digiconomist.net/bitcoin-energy-consumption/ This is more of a history question, ...
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1answer
56 views

how to recover funds from blockchain

I forgot my password of Blockchain Wallet and i tried to recover from (12 word backup phrase key but it has generated a new wallet) on the same 12 word backup key and it has different (wallet ID) but ...
1
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1answer
16 views

What to look for in Bitcoin-core logfile when something bad happens

About a week ago I was trying to reorganise my file structure with Bitcoin Core, I accidentally moved the file before listing it as a backup so when I opened Core, it didn't work. I tried returning ...
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2answers
107 views

If Lightning Network takes transactions off Blockchain, would that defeat the whole purpose of having a Blockchain ledger?

Currently Bitcoin transactions can take around 45 minutes. If everyone in the world uses Bitcoin, computers would have to consume 1000 of terabytes per Hour. The solution is the Lightning network, ...
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1answer
39 views

Can I see the workings (console) of my bitcoin full node?

I have just completed the IBD of my bitcoin full node on Bitcoin Core on Linux. When I open Bitcoin Core, i just get the basic wallet interface. It there anyway of seeing what the node is doing behind ...
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2answers
68 views

Will Bitcoin copy Best Features of Litecoin, Ripple, if its Open Source?

Proponents of Bitcoin always mention that Bitcoin is Open Source, so if any better cryptocurrency comes along, Bitcoin can just copy those features in their open source. Both Litecoin and Ripple have ...
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3answers
2k views

Will BTC script be Turing complete in future?

I want to know if BTC script will have loops in it in the future?
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1answer
27 views

Balance in bitcoin-qt suddenly significantly diminished after a small transaction?

I had my wallet stored on a storage provider for a while, and recently got a new computer and installed bitcoin-qt and imported my wallet. It said I had about 2 BTC and showed INGOING transactions ...
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1answer
100 views

51% attack, miners, nodes or both

If 51% of the hashrate was controlled by bad actors mining invalid blocks, this would become the longest chain. Where do nodes come into the 51% attack? The canonical chain is the longest chain. Is ...
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1answer
35 views

How much info share bitcoin nodes between other nodes?

1.If we assume bitcoin nodes share the other nodes addresses in the end every node know other nodes adresses right? 2.If we share data through network every node share the same information other ...
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1answer
42 views

How do nodes contribute to security when the power comes from mining and what is the chain of transaction validation?

Blockchain security comes from the decentralisation of hashing power by miners. They append transactions to a block, perform PoW and add them to the blockchain when that validate blocks. How do nodes ...

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